your severly handicapped with the F23 motor. Not very much stuff available for it, and any amount of real money you spend you wont see very good gains.

they have a huge stroke, so revving the motor with a cam isnt a viable option.

For the price it will cost you for an intake manifold, cam, cam gear, tuning, header, etc, your better off switching to the H22 longblock.

you can pick up a low mileage H22 for around $900-1000. the h22 comes stock with 180whp(200hp) and they have way more mods available to them.

dont try an reinvent the wheel, get the H motor an youll be much happier